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Pros

Pro

Free, open source and community driven

Firefox is available as a free download. All Mozilla software is licensed under the Mozilla Public License. Instructions on how to obtain the source code can be found here.

Pro

Functionality can be extended with add-ons

By far the best browser if not using an adblocking app like AdAway or Adguard. Adblocking, Privacy, Themes/Stylish, etc. Add-ons make Firefox the best total package mobile browser... You may even forget you're using a mobile browser.

Pro

Ethical and pragmatic company mission

The Mozilla Manifesto outlines the company's mission and principles. Paraphrasing, they want the Internet to be a free and open resource, and to enable individuals to get the best use of that resource. They do this by creating open source software to which anyone may contribute, so long as such contributions fit with their principles (both ethical and technical).

Pro

HTML5, mobile video support

Firefox for Android supports HTML5, and with support for multiple video formats, you can watch videos right in the browser.

Pro

Great efficient and intuitive UI

The scrolling and response is generally faster than Chrome on my Android devices.

Pro

Built-in reading mode

Reading mode allows removing everything on a page but the text. It removes ads, styling and anything else that could get in the way of a comfortable reading experience.

Pro

Sync with desktop browser

Keep track of all your bookmarks, passwords, open tabs, and history on the go.